{
  "bibcode": "2016GCN.19043....1L",
  "body": "A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU),\nT. N. Ukwatta (LANL) (i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 160220B (trigger #674734)\n(Cummings, et al., GCN Circ. 19029).  The BAT ground-calculated position is\nRA, Dec = 259.851, -18.123 deg which is\n    RA(J2000)  =  17h 19m 24.2s\n    Dec(J2000) = -18d 07' 21.4\"\nwith an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 38%.\n\nThe mask-weighted light curve shows a double-peaked structure from T-10 to\nT+40 seconds.  The spacecraft slewed away from the burst location at ~T+145\nsec due to a pre-planned maneuver.  T90 (15-350 keV) is 31.4 +- 2.6 sec \n(estimated error including systematics).\n\nThe time-averaged spectrum from T-7.58 to T+37.54 sec is best fit by a power law\nwith an exponential cutoff.  This fit gives a photon index 0.75 +- 0.20,\nand Epeak of 168.7 +- 56.3 keV (chi squared 39.67 for 56 d.o.f.).  For this\nmodel the total fluence in the 15-150 keV band is 7.0 +- 0.2 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+6.46 sec in the 15-150 keV band is\n6.6 +- 0.4 ph/cm2/sec.  A fit to a simple power law gives a photon index\nof 1.20 +- 0.05 (chi squared 56.26 for 57 d.o.f.).  All the quoted errors\nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/674734/BA/",
  "circularId": 19043,
  "createdOn": 1456065478000,
  "email": "hans.a.krimm@nasa.gov",
  "subject": "GRB 160220B: Swift-BAT refined analysis",
  "submitter": "Hans Krimm at NASA-GSFC  <hans.a.krimm@nasa.gov>",
  "eventId": "GRB 160220B"
}